Segmented Insensitive Munitions Detonator Train
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Solution Overview
Problem
Existing detonator systems for insensitive munitions are sensitive to shock, friction, and static discharges due to the use of lead azide and lead styphnate, which are hazardous and expensive, and lack a reliable method to initiate new, more insensitive main charge explosives without accidental initiation.
Innovation Solution
A detonator train comprising multiple segments of insensitive energetic materials like RDX, compacted under varying pressures, where the first segment is easily initiated by a shock cord or fuse, and subsequent segments are progressively harder to initiate, ensuring that only the last segment, compacted under the highest pressure, detonates the main charge, eliminating the need for lead azide and lead styphnate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead azide and lead styphnate are used in detonator systems, then the detonator can reliably initiate insensitive main charge explosives, but the system becomes sensitive to shock, friction, and static discharges
Solution Approach 1:
The detonator is divided into multiple segments with different compaction densities. The first segment has lower compaction density and is initiated by the shock cord, while subsequent segments have progressively higher compaction densities. This segmentation allows the system to achieve reliable initiation of insensitive explosives without requiring sensitive materials like lead azide and lead styphnate, as each segment progressively transmits the detonation wave with increasing energy.
Solution Approach 2:
The invention changes the compaction density parameter of the explosive segments along the detonation train. By varying the compaction pressure applied to each segment, the system creates a gradient where earlier segments are more easily initiated and later segments have higher density for more reliable detonation of the main charge. This parameter change eliminates the need for sensitive initiating materials while maintaining reliability.
2Stability of the object's composition
If existing booster explosives and fuses are used, then the current munition inventory can be maintained, but they lack sufficient energy output to reliably initiate new insensitive main charge explosives
Solution Approach 1:
The booster explosive is segmented into multiple sections with varying compaction densities. The first section has lower density and is easier to initiate, while subsequent sections have progressively higher density. This segmentation creates a progressive energy release that builds up sufficient energy output to reliably initiate insensitive main charge explosives like PBXN-103 and PBXN-109, while maintaining the insensitivity of the overall system.
Solution Approach 2:
The invention uses composite structures within the booster, combining explosive material with varying compaction densities in different sections. This composite approach allows the booster to achieve both the insensitivity required for modern munitions and the sufficient energy output needed to initiate insensitive main charges, resolving the contradiction between stability and energy output.
3Ease of operation
If conventional detonators with lead-based compounds are used, then the detonation can be initiated, but the system becomes vulnerable to accidental initiation and external threats
Solution Approach 1:
The invention extracts and eliminates lead-based compounds (lead azide, lead styphnate) from the detonator system. Instead, it uses a segmented explosive train with varying compaction densities that can be initiated by a shock cord or fuse. This removal of harmful materials maintains ease of operation while eliminating vulnerability to accidental initiation from static discharges, bullet impacts, and other external threats.
Solution Approach 2:
The invention replaces expensive and hazardous lead-based initiating compounds with a simpler segmented explosive structure that uses the same insensitive explosive material at different compaction densities. This substitution maintains operational effectiveness while reducing vulnerability to external threats and eliminating the need for special handling procedures associated with lead-based materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a safe, reliable, and insensitive detonation system capable of initiating insensitive munitions at extreme temperatures without accidental initiation, reducing the risk of detonation from stimuli like bullet impacts or heat, and is less vulnerable to radio waves and other external threats.
Implementation Method 1
each segment being formed by compacting under pressure powdered or granular insensitive energetic composition having a sensitivity to detonation which decreases with an amount of compressive force applied in compaction
Data Source
AI summary
A detonator formed entirely from a plurality of discrete segments of an insensitive energetic composition, each of the segments employed in the detonator being compacted at different pressures from powder and/or granules of insensitive energetic composition so as to form an energetic train which sequences detonation of the individual segments. Initiation of a main charge can only be effected when a last segment in the detonation train is initiated. Detonation starts with a first segment in the detonation train which is produced under the lowest compaction pressure, and then detonation progresses to a last segment compacted under a higher compaction pressure. The first segment can be detonated by a safety fuse or detonating cord, and the last segment can only be detonated by the next to the last segment in the detonation train.